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Earnings Per Share: Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income available for common stock	$ 96,316	$ 93,174
Weighted average shares - basic (in shares)	62,633	61,778
Dilutive effect of:
Equity compensation (in shares)	58	78
Weighted average shares - diluted (in shares)	62,691	61,856
Earnings per share, Basic (usd per share)	$ 1.54	$ 1.51
Earnings per share, Diluted (usd per share)	$ 1.54	$ 1.51

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